kern_softint.c revision 1.4.2.2
1 1.4.2.2 matt /* $NetBSD: kern_softint.c,v 1.4.2.2 2007/11/06 23:31:58 matt Exp $ */ 2 1.4.2.2 matt 3 1.4.2.2 matt /*- 4 1.4.2.2 matt * Copyright (c) 2007 The NetBSD Foundation, Inc. 5 1.4.2.2 matt * All rights reserved. 6 1.4.2.2 matt * 7 1.4.2.2 matt * This code is derived from software contributed to The NetBSD Foundation 8 1.4.2.2 matt * by Andrew Doran. 9 1.4.2.2 matt * 10 1.4.2.2 matt * Redistribution and use in source and binary forms, with or without 11 1.4.2.2 matt * modification, are permitted provided that the following conditions 12 1.4.2.2 matt * are met: 13 1.4.2.2 matt * 1. Redistributions of source code must retain the above copyright 14 1.4.2.2 matt * notice, this list of conditions and the following disclaimer. 15 1.4.2.2 matt * 2. Redistributions in binary form must reproduce the above copyright 16 1.4.2.2 matt * notice, this list of conditions and the following disclaimer in the 17 1.4.2.2 matt * documentation and/or other materials provided with the distribution. 18 1.4.2.2 matt * 3. All advertising materials mentioning features or use of this software 19 1.4.2.2 matt * must display the following acknowledgement: 20 1.4.2.2 matt * This product includes software developed by the NetBSD 21 1.4.2.2 matt * Foundation, Inc. and its contributors. 22 1.4.2.2 matt * 4. Neither the name of The NetBSD Foundation nor the names of its 23 1.4.2.2 matt * contributors may be used to endorse or promote products derived 24 1.4.2.2 matt * from this software without specific prior written permission. 25 1.4.2.2 matt * 26 1.4.2.2 matt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 1.4.2.2 matt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 1.4.2.2 matt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 1.4.2.2 matt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 1.4.2.2 matt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 1.4.2.2 matt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 1.4.2.2 matt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 1.4.2.2 matt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 1.4.2.2 matt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 1.4.2.2 matt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 1.4.2.2 matt * POSSIBILITY OF SUCH DAMAGE. 37 1.4.2.2 matt */ 38 1.4.2.2 matt 39 1.4.2.2 matt /* 40 1.4.2.2 matt * Stub for code to be merged from the vmlocking CVS branch. 41 1.4.2.2 matt */ 42 1.4.2.2 matt 43 1.4.2.2 matt #include <sys/cdefs.h> 44 1.4.2.2 matt __KERNEL_RCSID(0, "$NetBSD: kern_softint.c,v 1.4.2.2 2007/11/06 23:31:58 matt Exp $"); 45 1.4.2.2 matt 46 1.4.2.2 matt #include <sys/param.h> 47 1.4.2.2 matt #include <sys/intr.h> 48 1.4.2.2 matt 49 1.4.2.2 matt u_int softint_timing; 50 1.4.2.2 matt 51 1.4.2.2 matt /* 52 1.4.2.2 matt * softint_init: 53 1.4.2.2 matt * 54 1.4.2.2 matt * Initialize per-CPU data structures. Called from mi_cpu_attach(). 55 1.4.2.2 matt */ 56 1.4.2.2 matt void 57 1.4.2.2 matt softint_init(struct cpu_info *ci) 58 1.4.2.2 matt { 59 1.4.2.2 matt 60 1.4.2.2 matt /* nothing yet */ 61 1.4.2.2 matt } 62 1.4.2.2 matt 63 1.4.2.2 matt /* 64 1.4.2.2 matt * softint_establish: 65 1.4.2.2 matt * 66 1.4.2.2 matt * Register a software interrupt handler. 67 1.4.2.2 matt */ 68 1.4.2.2 matt void * 69 1.4.2.2 matt softint_establish(u_int flags, void (*func)(void *), void *arg) 70 1.4.2.2 matt { 71 1.4.2.2 matt u_int level; 72 1.4.2.2 matt 73 1.4.2.2 matt level = (flags & SOFTINT_LVLMASK); 74 1.4.2.2 matt KASSERT(level < SOFTINT_COUNT); 75 1.4.2.2 matt 76 1.4.2.2 matt switch (level) { 77 1.4.2.2 matt case SOFTINT_CLOCK: 78 1.4.2.2 matt level = IPL_SOFTCLOCK; 79 1.4.2.2 matt break; 80 1.4.2.2 matt case SOFTINT_NET: 81 1.4.2.2 matt case SOFTINT_BIO: 82 1.4.2.2 matt level = IPL_SOFTNET; 83 1.4.2.2 matt break; 84 1.4.2.2 matt case SOFTINT_SERIAL: 85 1.4.2.2 matt #ifdef IPL_SOFTSERIAL 86 1.4.2.2 matt level = IPL_SOFTSERIAL; 87 1.4.2.2 matt #else 88 1.4.2.2 matt level = IPL_SOFTNET; 89 1.4.2.2 matt #endif 90 1.4.2.2 matt break; 91 1.4.2.2 matt default: 92 1.4.2.2 matt panic("softint_establish"); 93 1.4.2.2 matt } 94 1.4.2.2 matt 95 1.4.2.2 matt return softintr_establish(level, func, arg); 96 1.4.2.2 matt } 97 1.4.2.2 matt 98 1.4.2.2 matt /* 99 1.4.2.2 matt * softint_disestablish: 100 1.4.2.2 matt * 101 1.4.2.2 matt * Unregister a software interrupt handler. 102 1.4.2.2 matt */ 103 1.4.2.2 matt void 104 1.4.2.2 matt softint_disestablish(void *arg) 105 1.4.2.2 matt { 106 1.4.2.2 matt 107 1.4.2.2 matt softintr_disestablish(arg); 108 1.4.2.2 matt } 109 1.4.2.2 matt 110 1.4.2.2 matt /* 111 1.4.2.2 matt * softint_schedule: 112 1.4.2.2 matt * 113 1.4.2.2 matt * Trigger a software interrupt. Must be called from a hardware 114 1.4.2.2 matt * interrupt handler, or with preemption disabled (since we are 115 1.4.2.2 matt * using the value of curcpu()). 116 1.4.2.2 matt */ 117 1.4.2.2 matt void 118 1.4.2.2 matt softint_schedule(void *arg) 119 1.4.2.2 matt { 120 1.4.2.2 matt 121 1.4.2.2 matt softintr_schedule(arg); 122 1.4.2.2 matt } 123 1.4.2.2 matt 124 1.4.2.2 matt /* 125 1.4.2.2 matt * softint_block: 126 1.4.2.2 matt * 127 1.4.2.2 matt * Update statistics when the soft interrupt blocks. 128 1.4.2.2 matt */ 129 1.4.2.2 matt void 130 1.4.2.2 matt softint_block(lwp_t *l) 131 1.4.2.2 matt { 132 1.4.2.2 matt 133 1.4.2.2 matt /* nothing yet */ 134 1.4.2.2 matt } 135 1.4.2.2 matt 136 1.4.2.2 matt /* 137 1.4.2.2 matt * softint_picklwp: 138 1.4.2.2 matt * 139 1.4.2.2 matt * Slow path: called from mi_switch() to pick the highest priority 140 1.4.2.2 matt * soft interrupt LWP that needs to run. 141 1.4.2.2 matt */ 142 1.4.2.2 matt lwp_t * 143 1.4.2.2 matt softint_picklwp(void) 144 1.4.2.2 matt { 145 1.4.2.2 matt 146 1.4.2.2 matt panic("softint_picklwp"); 147 1.4.2.2 matt } 148 1.4.2.2 matt 149 1.4.2.2 matt /* 150 1.4.2.2 matt * softint_overlay: 151 1.4.2.2 matt * 152 1.4.2.2 matt * Slow path: called from lwp_userret() to run a soft interrupt 153 1.4.2.2 matt * within the context of a user thread. If the LWP blocks, 154 1.4.2.2 matt * priority will be elevated in sched_kpri(). 155 1.4.2.2 matt */ 156 1.4.2.2 matt void 157 1.4.2.2 matt softint_overlay(void) 158 1.4.2.2 matt { 159 1.4.2.2 matt 160 1.4.2.2 matt panic("softint_overlay"); 161 1.4.2.2 matt } 162 1.4.2.2 matt 163 1.4.2.2 matt /* 164 1.4.2.2 matt * softint_kpri: 165 1.4.2.2 matt * 166 1.4.2.2 matt * Adjust priority for a blocking user LWP that is handling a 167 1.4.2.2 matt * soft interrupt. 168 1.4.2.2 matt */ 169 1.4.2.2 matt pri_t 170 1.4.2.2 matt softint_kpri(lwp_t *l) 171 1.4.2.2 matt { 172 1.4.2.2 matt 173 1.4.2.2 matt /* No point doing anything more fair / complicated. */ 174 1.4.2.2 matt return PRI_SOFTSERIAL; 175 1.4.2.2 matt } 176
Indexes created Mon Sep 22 13:09:51 GMT 2025